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 NEW YORK (AP) - In a multimillion-dollar swap, a California collector traded a block of four 1918 stamps bearing the image of an upside-down plane Wednesday for an equally rare 1868 one-cent stamp.
The blockbuster transaction filled out what experts believe is the only complete collection of 19th-century U.S. stamps.
The block of four stamps is valued at $3 million, and the single "Z Grill" stamp is similarly valued.
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